Question

15. 80 g of oxygen contain as many atoms as in
(a) 10 g of hydrogeno (b) 5 g of hydrogen
(c) 80 g of hydrogen (d) 1 g of hydrogen​

Answer 1

Explanation:

moles of oxygen = 80 ÷ 16 = 5

therefore, no of molecules= 5× N*

thus, answer is (b)

*N = Avagadro's number

this is assuming that the oxygen mentioned in the question is oxygen atom